So just how good was the A-Body back in its day?

I bought a used 69 Dart GTS 340 4 speed car back in 1972 or 73. The car was nice with buckets and console. The E70's didn't stand a chance since the rear was a 3.23 one legger. Eventually I rebult the motor and put a 4.10 suregrip in it. The car was fast.